Angles in the opposite segments are equal., , Tangents from a point meet at right angles., , A radius perpendicular to chord bisects that chord., , Angles in the same segment are equal., , The angle at the centre is double the angle at the circumference., , Opposite angles in a cyclic quadrilateral add up to 180°., , Angles in a semi-circle equal 90°., , Two tangents from a point are equal in length..

circle theorems match

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